JPH09166120A - Nut made of synthetic resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a nut made of synthetic rein having a loosening preventing function. SOLUTION: A flange 12 having resiliency is molded integrally with the bearing surface side 11a of a nut body 11 made of synthetic resin, and a protrusion 13 for preventing loosening of a nut is integrally molded closer to the outer periphery on the bearing surface side of the flange 12. A flange 22 having resiliency is integrally molded on the bearing surface side 21a of a nut body 21 made of synthetic resin. The flange 22 is formed in such a manner that a portion 22a closer to an outer periphery on the bearing surface side is first seated by protruding the portion 22a closer to an outer periphery on the bearing surface side from a portion 22b closer to an inner periphery on the bearing surface side.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to prevention of loosening of nuts made of synthetic resin and made of synthetic resin.

[0002]

2. Description of the Related Art Nuts made of synthetic resin are used for the purpose of rust prevention and weight reduction. As an example of use, as shown in FIG. 3, in order to attach the ball tap 2 to the toilet bowl cleaning tank body 1, the synthetic resin nut 3 is tightened to the male screw 2a of the ball tap 2 protruding to the outside of the tank body 1. There is something. In this case, the spring washer 4 is sandwiched between the tank body 1 and the synthetic resin nut 3 to prevent the synthetic resin nut 3 from loosening.

[0003]

However, since the spring washer 4 is formed from spring steel, it easily rusts, and since it is a separate body from the synthetic resin nut, it takes time and effort to mount it. Therefore, in order to solve the above problems, an object of the present invention is to provide a synthetic resin nut having a relaxation preventing function.

[0004]

The gist of the present invention according to claim 1 is to integrally form a resilient flange on the seat surface side of a synthetic resin nut body, and to loosen the nut near the seat surface side outer periphery of the flange. The nut made of synthetic resin is characterized in that a projection for prevention is integrally formed. As the nut body made of synthetic resin is tightened to the male screw, the nut-relaxation-preventing projection is seated on the seating surface and the repulsive elastic energy is stored in the flange, and the projection is pressed against the seating surface with a large compressive stress. The large residual compressive stress generated in the protrusion causes a large frictional resistance with the seating surface and prevents the nut from loosening.

According to a second aspect of the present invention, a flange having elasticity is integrally formed on the seat surface side of the nut body made of synthetic resin, and the flange is closer to the seat surface side outer periphery than to the seat surface side inner periphery. The nut made of synthetic resin is characterized in that the outer periphery of the seat surface side is seated first by projecting it. As the nut body made of synthetic resin is tightened on the male screw, the outer peripheral surface of the flange is seated on the seated surface and repulsive elastic energy is stored in the seated surface. Press with.
A large residual compressive stress generated near the outer periphery of the flange on the bearing surface side causes a large frictional resistance between the flange and the seated surface to prevent the nut from loosening.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a synthetic tree nut according to the present invention (hereinafter referred to as "the present nut") will be described with reference to an embodiment shown in the drawings.

(First Embodiment) FIGS. 1A and 1B show a first embodiment of the nut of the present invention. FIG. 1A is a plan view, and FIG. 1B is a front view of a right half section. . The nut 10 of the present invention according to the present embodiment has an annular flange 12 having elasticity on the bearing surface side 11a of the nut body 11 made of synthetic resin.
And a projection 13 for preventing nut relaxation is formed near the outer periphery of the flange 12 on the bearing surface side. The nut 10 of the present invention is made of a synthetic resin such as polyphenylene ether (PPE), and a nut main body 11, a flange 12 and a protrusion 13 made of a synthetic resin are integrally formed. The protrusion 13 is formed in one or a plurality of continuous annular shapes, or is formed intermittently (not shown) in the circumferential direction.

The nut body 11 made of synthetic resin is provided with vertical streak-like projections 14 on its outer peripheral surface 11b for each circumferential pitch so that the claws of a tightening tool (not shown) can be locked. is there.

In the nut 10 of the present invention, as the nut body 11 made of synthetic resin is fastened to the male screw 15, the nut loosening prevention projection 13 is first seated on the seating surface 16 such as a washing tank, and tightening is performed. When it advances, repulsive elastic energy is stored in the flange 12, and the projection 13 is pressed against the seated surface 16 with a large compressive stress. The large compressive stress generated in the protrusions causes a large frictional resistance with the seated surface 16 and prevents the nut 10 from loosening. The protrusion 13
When formed intermittently (not shown) in the circumferential direction, the contact area with the crimping surface 16 is reduced to increase the compressive stress and further improve the loosening prevention.

(Second Embodiment) FIGS. 2A and 2B show a second embodiment of the nut of the present invention. FIG. 2A is a plan view and FIG. 2B is a front view showing a right half section. . In the nut 20 of the present invention according to the present embodiment, a flange 22 having elasticity is integrally formed on the seat surface side 21a of a nut body 21 made of synthetic resin, and the flange 22 has a seat surface side outer peripheral portion 22a.
Is formed in a flat truncated cone shape projecting from the seat surface side inner peripheral portion 22b, so that the seat surface side outer peripheral portion 22a is seated first. The nut 20 of the present invention is
A synthetic resin nut body 21 and a flange 22 are integrally formed of synthetic resin such as polyphenylene ether (PPE). The nut body 21 made of synthetic resin has an outer peripheral surface 2
1b is formed in a hexagonal shape.

In the nut 20 of the present invention, as the nut body 21 made of synthetic resin is fastened to the male screw 15, the seat 22 on the seating surface 16 of the cleaning tank or the like is offset toward the outer peripheral surface 22 of the flange 22.
When a is seated and tightening proceeds, repulsive elastic energy is stored in the flange 22, and the seat surface side outer peripheral portion 22a is pressed against the seated surface 16 with a large compressive stress. The large residual compressive stress generated on the seat surface side outer peripheral portion 22a generates a large frictional resistance with the seated surface 16 and prevents the nut 20 from loosening. The flange 22 may be provided with an uneven portion on the surface of the seat surface side outer peripheral portion 22a that contacts the seated surface 16 in order to reduce the contact area with the crimping surface 16 and increase the compressive stress.

[0012]

As described in detail above, the nut of the present invention stores repulsive elastic energy in the flange with tightening to generate a large frictional resistance between the nut and the seated surface, thereby preventing the nut from loosening. As a result, the nut of the present invention does not require a spring washer made of spring steel, and has an excellent effect of dramatically reducing the time and effort for mounting.

[Brief description of the drawings]

1A and 1B show a first embodiment of a nut of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a front view showing a right half section.

2A and 2B show a second embodiment of the nut of the present invention, in which FIG. 2A is a plan view and FIG. 2B is a front view of a right half section.

FIG. 3 is a front view showing a cross section of a toilet bowl cleaning tank using a conventional nut.

[Explanation of symbols]

 11 (21) ... Synthetic resin nut body 11a (21a) ... Seating surface side 12 (22) ... Flange 13 ... Protrusion 22a ... Seating surface side outer peripheral side 22b ... Seating surface side inner peripheral side

Claims (2)

[Claims] 1. A synthetic resin nut body is integrally formed with a flange having elasticity on the bearing surface side, and a projection for preventing nuts from loosening is integrally molded near the outer periphery of the flange on the bearing surface side. Nut made of synthetic resin. 2. A synthetic resin nut body is integrally formed with a flange having elasticity on the seat surface side, and the flange has a seat surface side outer circumference projected by projecting a seat surface side outer circumference side from a seat surface side inner circumference side. A nut made of synthetic resin characterized in that the lean side is seated first.